Question

5. A dealer sells a pen for rs 24 and gains as much per cent as the cost price of the pen.
Find the cost price of the pen.​

Answer 1

Answer:

SP = CP + gain

Sp = 24

x+ x/100= 2400

xsquare + 100x - 2400 = 0

x2+120x-20x-2400=0

x(x+120x) - 20(x+120)= 0

as cost can't be negative value

hence CP=x=20

Answer 2

Step-by-step explanation:

let the cp of pen be x

so, sp = CP × (100 + profit percent)/ 100

24 = x × (100+x) /100

2400 = 100x + x^2

x^2 + 100x - 2400 = 0

x^2 +120x -20x -2400 = 0

x(X +120) -20(X +120) = 0

(X -20) (X +120) = 0

x = 20 or X = -120

CP = 20 or -120